geometry calculator

30-60-90 Triangle Calculator

30-60-90 Triangle Calculator for layout notes, drafting, and classroom geometry when you want a fixed formula answer without improvising the math by hand.

Important Use Notice

Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.

Estimate

Enter job values, review the estimate, then use the decision hints before ordering or quoting.

Estimate Results

Enter values to see the result.

Formula

long leg = short leg x sqrt(3), hypotenuse = 2 x short leg

This special right triangle keeps a fixed side ratio of 1 : sqrt(3) : 2.

The input on this page is the short leg opposite the 30-degree angle.

Example

5 units gives Long Leg 8. 6603, Hypotenuse 10.

Check

Mixing units, scales, or coordinate conventions across short leg before calculating long leg and hypotenuse.
Rounding too early when the result still feeds another geometry or algebra step.

Next Step

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